The IIW Type Calibration Block 

IIW type blocks are used to calibrate instruments for both angle beam and normal incident inspections. Some of their uses include setting metal-distance and sensitivity settings, determining the sound exit point and refracted angle of angle beam transducers, and evaluating depth resolution of normal beam inspection setups. Instructions on using the IIW type blocks can be found in the annex of American Society for Testing and Materials Standard E164, Standard Practice for Ultrasonic Contact Examination of Weldments.

IIW-Type 1 (Aluminium or Steel) 

Used for calibration of shear and longitudinal transducers, and verification of shear wedge exit point and refracted angle. Can also be used for resolution and sensitivity checking. In accordance with: IIW (International Institute of Welding) and ASTM E164, U.S. Customary Block.

• DIMENSIONS: 1.0″ X 4.0″ X 12.0″
• FEATURES: 4.0″ RADIUS, 2.0″ AND .060″ DIAMETER HOLE, .240″ DEEP X .080″ WIDE SLOT, AND 1.0″ RADIUSSED SLOT X .060″ DEEP X .120″ WIDE.

IIW-Type 2 (Aluminium or Steel) 

A modified version of the original IIW-Type 1 design. Includes a 2.0" radius x .250" deep cut-out superposed on the 4.0" radius for distance calibration. Also includes numbers 3, 5 and 8 through holes (3/64", 5/64" AND 8/64" diameter) and distance calibration marks to the 2.0" hole. In accordance with International Institute of Welding, ASTM E164 and U.S. Air Force NDI Manual T.O. 33B-1-1 specifications.

• DIMENSIONS: 12.0" X 4.0" X 1.0"
• NSN (NATIONAL STOCK NUMBER) IS 6635-00-415-9225